New records and range extensions for Rosa (Rosaceae) in North America

  • Walter H. Lewis Biology Department, Washington University and Missouri Botanical Garden
  • Memory Elvin-Lewis Biology Department, Washington University and Missouri Botanical Garden


The genus Rosa L. (Rosaceae) was recently treated floristically for North America, but range extensions and an additional taxon have been confirmed since then and are detailed here. These new reports document range extensions in the US and Canada of some native and introduced Rosa species, and new distributions and population data for several established Rosa hybrids (nothospecies). Some introduced European species and some nothospecies are more widespread than previously realized, and some are actively spreading.



Bruun, H.H. 2005. Biological flora of the British Isles. No. 239. J. Ecology 93:441–470.
Erlanson, E.W. 1931. Sterility in wild roses in some species hybrids. Genetics 16:76–96.
Erlanson, E.W. 1934. Experimental data for a revision of the North American Wild Roses. Bot. Gaz. 96:197–259.
Haines, A. 2011. New England Flower Society’s Flora Nova Anglia. Yale University Press, New Haven, CT, U.S.A.
Klástersk?, I. 1968. Rosa (Rosaceae). Flora Europaea, Vol. 2: Rosaceae to Umbelliferae. Cambridge University Press. Cambridge, England. Pp. 25–32.
Kr?ssman, G. 1981. The complete book of roses, Timber Press, Portland, OR, U.S.A.
Lewis, W.H. 1958. A monograph of the genus Rosa in North America. I. Rosa acicularis. Brittonia 11:1–24.
Lewis, W.H. 1962. Monograph of Rosa in North America. IV. Rosa × dulcissima. Brittonia 14:65–71.
Lewis, W.H. 2008. Rosa carolina (Rosaceae) subspecies and hybrids in eastern and midwestern United States, Canada, and Mexico. Novon 18(2):192–198.
Lewis, W.H., A.A. Reznicek, & R.K. Rabeler. 2012. Identifications and typifications of Rosa (Rosaceae) taxa in North America described or used by E.W. Erlanson, 1925–1934. Novon 22:32–42.
Lewis, W.H., B. Ertter, & A. Bruneau. 2015. Rosa (Rosaceae). Flora of North America, Volume 9: Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press. Pp. 75–119.
Lewis, W.H. 2016. Nomenclatural novelties in Rosa (Rosaceae) subgenus Rosa recognized in North America. Novon 25:22–46.
Lewis, W.H. & M. Elvin-Lewis. 2017. The worldwide significance of karyotype variation in Rosa acicularis Lindl. J. Bot. Res. Inst. Texas 11(2):In Press.
Willmott, E.A.1991. The genus Rosa. Marion McKensey Publisher, Deadwood, OR, U.S.A.
How to Cite
Lewis , W. H., & Elvin-Lewis, M. (2017). New records and range extensions for Rosa (Rosaceae) in North America. Journal of the Botanical Research Institute of Texas, 11(1), 185-191.